Live sound from multiple sound makers is streamed from a set of wireless transmitters placed at opposing sides of an urban space. These transmitters broadcast these audio streams locally on the same radio frequency to a group of participants wearing wireless headphones tuned to this frequency. Because the transmitters broadcast on the same local frequency, a zone of interference is created where multiple audio streams compete for signal dominance.

Participants carry umbrellas made of electromagnetic field (EMF) shielding fabric that enable them to actively shape the surrounding environment of radio waves. By orienting the umbrella in different ways, one is able to filter the interfering radio signals and select a single audio stream to listen to.

The movements of the crowd are sensed by accelerometers attached to the umbrellas and this data is broadcast locally to the sound makers via an ad-hoc wireless network, who in turn use these data streams to modify the sound streams. The resultant feedback loop provides for a form of indirect communication, where the sound producers influence bodily movement of the crowd that in turn influences the sounds the producers make.